1MHz 3A Step-Down DC/DC Converter
Typical Characteristics
Inrush and Output Overshoot Characteristics
(3A Load)
14
12
6
4
2
0
AAT1154
Inrush and Output Overshoot Characteristics
(No Load)
14
12
6
Inductor Current
Inductor Current
4
2
0
-2
Inductor Current (A)
(top trace)
Inductor Current (A)
(top trace)
Voltage (V)
(bottom traces)
Voltage (V)
(bottom traces)
10
8
6
4
2
0
-2
0
0.4
0.8
1.2
1.6
2
10
8
6
4
2
0
-2
0
0.4
0.8
1.2
1.6
2
Input
Output
-2
-4
-6
-8
-10
Input
Output
-4
-6
-8
-10
Time (ms)
Time (ms)
Output Ripple
(I
OUT
= 3.0A; V
OUT
= 3.3V; V
IN
= 5.0V)
4
2
7
6
4
2
Output Ripple
(I
OUT
= 3.0A; V
OUT
= 3.3V; V
IN
= 5.0V)
7
6
AC Output Ripple
top (mV)
AC Output Ripple
(top) (mV)
Inductor Current
(bottom) (A)
Inductor Current
(bottom) (A)
0
-2
-4
-6
-8
-10
-12
0
1
2
3
4
5
5
4
3
2
0
-2
-4
-6
-8
-10
-12
0
1
2
3
4
5
5
4
3
2
300µF 6.3VCeramic
TDK P/N C3325X5R0J107M
1
0
-1
200μF 6.3V Ceramic
TDK P/N C3325X5R0J107M
1
0
-1
Time (μs)
μ
Time (μs)
μ
Tantalum Output Ripple
(I
OUT
= 3.0A; V
OUT
= 3.3V; V
IN
= 5.0V)
16
Loop Crossover Gain and Phase
180
135
AC Output Ripple (top)
(mV)
40
20
0
-20
-40
-60
-80
-100
-120
0
1
2
3
4
5
7
6
12
8
Gain (dB)
5
4
3
2
Phase
3x 100μF
2x 100μF
100μF 6.3V Ceramic
TDK P/N C3225X5R0J107M
90
45
0
-45
-90
-135
-180
100000
Phase (degrees)
Inductor Current
(bottom) (A)
4
0
-4
-8
-12
120μF 6.3V Tantalum Vishay
P/N 594D127X96R3C2T
1
0
-1
-16
10000
Time (μs)
μ
Frequency (Hz)
1154.2006.09.1.6
7
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
